DNA – Chromosomes - Genes. DNA DNA: the chemical inside the nucleus of a cell that carries the genetic instructions for making living organisms. The material.

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Presentation transcript:

DNA – Chromosomes - Genes

DNA DNA: the chemical inside the nucleus of a cell that carries the genetic instructions for making living organisms. The material inside the nucleus of cells that carries genetic information. The scientific name for DNA is deoxyribonucleic acid.

Chromosomes A chromosome is one of the threadlike "packages" of genes and other DNA in the nucleus of a cell. Different kinds of organisms have different numbers of chromosomes. Humans have 23 pairs of chromosomes, 46 in all: 44 autosomes and two sex chromosomes. Each parent contributes one chromosome to each pair, so children get half of their chromosomes from their mothers and half from their fathers.

Gene A gene is the functional and physical unit of heredity passed from parent to offspring. Genes are pieces of DNA, and most genes contain the information for making a specific protein.

Genome A genome is all the DNA contained in an organism or a cell, which includes the chromosomes plus the DNA in mitochondria (and DNA in the chloroplasts of plant cells).